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Method for identifying valve control times of internal combustion engine

A technology of control time and valve control, applied in engine control, fuel injection control, internal combustion piston engine, etc., can solve problems such as not being able to easily draw specific conclusions on valve control time

Active Publication Date: 2017-02-15
VTESCO TECH GMBH
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is also not easy to draw specific conclusions about the valve control timing of internal combustion engines using this method

Method used

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Examples

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Embodiment Construction

[0048] The invention will be explained below with particular reference to exemplary embodiments. The exemplary method relates to a method for evaluating the relationship between dynamic pressure oscillations in an inlet section and valve control time of an inlet valve.

[0049] It goes without saying, however, that the invention also includes a method of evaluating the relationship between the dynamic pressure oscillations in the exhaust section and the valve control time of the outlet valve, and the passage between the inlet section and the outlet section The above interaction caused by the coupling of two systems.

[0050] The following example for calculating the valve control time at an internal combustion engine using the camshaft angular position, which can be adjusted relative to the crankshaft angle by means of a phaser, was originally based on the following measurements on a reference internal combustion engine:

[0051] a) measurement of dynamic pressure oscillation...

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Abstract

A method is described for identifying control times, in particular valve control times, of internal combustion engines. For this purpose, dynamic pressure fluctuations are measured in the inlet and / or outlet tract of the affected series of internal combustion engines and a crankshaft position feedback-signal is determined. Using discrete Fourier transformation, the phase angles of selected signal frequencies of the measured pressure fluctuations are determined and the valve control times of the affected series of internal combustion engines are determined based on these phase angles, under consideration of reference phase angles and reference valve control times of a reference internal combustion engine and / or model functions derived therefrom. By said means, an execution of a particularly exact identification of control times succeeds in a simple and cost-effective way, by which means advantages with respect to emissions, consumption, running smoothness, and output can be achieved as well as an improvement in the control and regulation of the engine.

Description

technical field [0001] The invention relates to a method for identifying valve control times of an internal combustion engine. Background technique [0002] Internal combustion engines are differentiated by multiple power strokes. During the so-called intake stroke, the working chamber is filled with a fresh gas charge (air or air / exhaust). During the so-called discharge stroke, the working chamber is emptied. The delimitation of the working chamber or the combustion chamber relative to the intake or exhaust section of the machine is usually achieved by means of valves (in the case of two-stroke engines, otherwise, by means of so-called control slits). [0003] According to the current state of the art, these valves are actuated by means of at least one camshaft. There are also typically mechanical components between the valve and the camshaft for transmitting force, which may also include valve play compensation (eg, valve lifters, toggle levers, rocker arms, push rods, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/00F02D41/14F02D41/28F02D41/24F02D13/02
CPCF02D13/0219F02D41/009F02D41/1448F02D41/2432F02D41/28F02D41/2464F02D41/0002F02D2200/0406F02D2041/288F02D2041/1433F02D2041/001Y02T10/12G01M15/106F02D2200/0402F02D41/2429F02D13/0215F02D13/0207F02D13/02F02D13/0203F02D13/0223F02D13/0234F02D13/0242
Inventor J.凯因茨T.布劳恩
Owner VTESCO TECH GMBH
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